Abstract: An internal combustion engine for use with a propeller driven aircraft includes a camshaft adapted to function as an output shaft that rotates a propeller to provide propulsive thrust. A gear set is configured to transfer rotational power from the crankshaft to the camshaft and to rotate the camshaft at a velocity that is proportional to the rotational velocity of the crankshaft. The gear set is disposed rearward of the engine housing rearward wall and is configured to rotate the camshaft in a direction opposite the crankshaft rotation. The length of the camshaft reduces engine torsional vibration. In one embodiment, the engine is a six-cylinder compression ignition engine having a boxer configuration and can generate a peak output power within a range from about 300 horsepower to about 350 horsepower.

Abstract: A heat exchanger includes a body defining a flow channel, and a pin extending across the flow channel, the pin including an at least partially non-cylindrical shape. The pin can be a double helix pin including two spiral branches defining a double helix shape. The two branches can include a uniform winding radius. The two branches include a non-uniform winding radius. The non-uniform winding radius can include a base radius and a midpoint radius, wherein the midpoint radius is smaller than the base radius. The two branches can be joined together by one or more cross-members.

Abstract: A cryogenic refrigerator includes a displacer having a flow channel that supplies a refrigerant gas to a regenerator; and a cylinder that accommodates the displacer so as to be movable in an axial direction, has a heat diffusion portion at a high-temperature end portion thereof, and forms a space portion together with a high-temperature end of the displacer. A clearance is formed between an outer peripheral surface of the displacer and an inner peripheral surface of the cylinder. The flow channel is made to open to the outer peripheral surface of the displacer, and the refrigerant gas within the room-temperature chamber flows into the regenerator through the clearance and the flow channel.

Abstract: A cylinder liner with a plurality of protrusions on its outside surface and the manufacturing method thereof are disclosed. The protrusions are ?-shaped, P-shaped or taper-shaped, and the ?-shaped, P-shaped and taper-shaped protrusions are accounted for 50-99.5%, 0.5-30% and 0-20% of the total number of protrusions, respectively. The density of the protrusions on the outside surface of the cylinder liner is 15-65 per square centimeter. The outer surface of the protrusions of the cylinder liner is curved, and has a large contact area and a concave which can be filled by an aluminum sheath to improve the radial bearing capacity, so as to effectively improve the bite force between the cylinder liner and the outside aluminum sheath and prevent the cylinder liner from breaking away from the cylinder body.

Abstract: The present invention discloses a monoblock engine in which the head and the block of the engine are cast integrally. The engine incorporates a cylinder and water coolant jackets, intake manifold and an exhaust manifold, vertical intake and exhaust valves, core removal holes, and a push-fit type cylinder liner which is secured in place so that leakage of fuel from the cylinder is eliminated. The water coolant jackets for the head and the block are connected using four water jacket gateways or connectors. The monoblock is fitted with the crankcase using a leak proof & robust flange-joint and mechanical fastening system which is easy to install. The invention is embodied for a single cylinder engine as well as multi-cylinder engines. By integrating cylinder head and manifolds with block, the critical joint between head and block and head and intake Manifold will be eliminated. At the same time, gasket and mechanical fasteners for tightening also can be eliminated.

Abstract: An EGR gas passageway member is removably attached to a motorcycle cylinder assembly between the cylinder head and the cylinder of said motorcycle cylinder assembly in manner such that presence of the EGR gas passageway member is partially concealed. The EGR gas passageway member allows motorcycles to be provided with EGR systems without significantly impacting the aesthetic appearance of the engines of such motorcycles.

Abstract: A motor chain saw has a motor housing with a drive unit for driving a saw chain on a guide bar. The drive unit is an internal combustion engine with a cylinder and a crankshaft extending transversely to a longitudinal axis of the motor chain saw. A drive pinion is mounted on a first end of the crankshaft. A cooling air blower with a blower wheel is mounted on the second end of the crankshaft. A cooling air stream of the blower flows transversely to the longitudinal axis of the motor chain saw about the cylinder and exits through a housing opening. A hand guard arranged between a handle and a front end of the guide bar is connected with one leg near the housing opening for the cooling air stream. In front of the housing opening a baffle element is supported on the leg of the hand guard.

Abstract: In an internal combustion engine (2) of a portable handheld work apparatus, the cylinder (3) is provided with cooling ribs (4, 4?). A cooling airflow is generated by the fan wheel (13) and is guided over the cooling ribs. A carburetor (9) is temperaturized as required by the heated cooling air. A control of the cooling airflow to the carburetor (9) takes place in that an opening (11), which passes the heated cooling air, is selectively closed or opened via a closure element (12). In order to obtain improved cooling of the cylinder during summer operation as well as during winter operation, the closure element (12) is provided with at least one air guide wall which extends essentially transversely to the cooling airflow and causes this cooling air to be partially backed up and deflected.

Abstract: Apparatus constituting part of an induction and fuel delivery system for a cylinder of a piston internal combustion engine comprising a small cyclone into which is tangentially discharged a flow of heated air to generate a sustained vortex of high rotational speed; a modulatable fuel injector delivering a flow of atomised fuel into said small cyclone wherein it underdoes flash evaporation and energetic mixing; a delivery duct connecting said small cyclone to the inlet tract of said cylinder wherein said vortex fuel-air mixture is mixed with heated induction air; and means to prevent overheating of said modulatable fuel injector.

Abstract: A head for an air-cooled engine having at least two cylinders, each cylinder having a longitudinal axis, the head having a rocker arm mounted to rotate about a rocker arm axis in the head, the head further including an intake port and an exhaust port, and the head mounted on a first cylinder of the two cylinders to define a combustion chamber, the head having at least two fins, each fin having a height-to-thickness ratio of greater than or equal to 5, each fin having a length that is at least 5 times the distance between the at least two fins at a location on the head that is between the first cylinder and the rocker arm axis on the head, and each fin positioned on the head with the fin length oriented along an axis that is substantially parallel to the longitudinal axis of the first cylinder.

Abstract: An automotive engine cover is provided that at least partly covers an automotive engine in an automotive engine compartment. The engine cover, includes, but is not limited to cooling fins that are made of a metallic or ceramic material. The automotive engine cover is provided with improved cooling effect as compared to known automotive engine covers. The improved cooling effect prolongs the life-time of the automotive engine cover. The improved cooling effect also help to increase the life-time of other components in the engine compartment, which otherwise may degrade, deform or even melt due to heat transfer from heat-generating components in the engine. In turn, this paves the way for the design of engines which may generate even more heat than today.

Abstract: To allow pollutants contained in atmospheric air to be treated effectively at all times during operation of a vehicle. A catalyst layer for treating atmospheric pollutants is formed on at least a surface of cooling fins provided on a cylinder portion of an engine mounted on a vehicle.

Abstract: A Dual Piston Cycle Engine utilizes a unique dual piston apparatus that includes: a first cylinder and housing a second cylinder thermally isolated from the first cylinder and housing a second piston therein; an intake valve coupled to the first cylinder for allowing a fuel mixture to enter into the first cylinder; an exhaust valve coupled to the second cylinder for allowing an exhaust gas to exit the second cylinder; and an interstage valve that couples an internal chamber of the first cylinder to an internal chamber of the second cylinder and configured to minimize dead space between the first and second cylinders, wherein the first piston performs only intake and compression stroked and the second piston performs only combustion and exhaust strokes and the first and second cylinders are thermally isolated from one another.

Abstract: A portable 4-cycle engine with a configuration which allows cooling air to flow in the direction of the crankshaft relative to a cylinder head on a cylinder, and a portable machine equipped with this engine, are provided, respectively. In such an engine, the cylinder is separated from the cylinder head including a combustion chamber formed at the cylinder side therein. The engine further comprises a valve train area formed in the cylinder head at the downwind side of the cooling air, and a plurality of vertical fins protruding upward from the cylinder head and extending in the direction of the crankshaft. The valve train area and the plurality of vertical fins are all integrally formed with the cylinder head, so that the cylinder head can be made thinner and lighter with high rigidity to enable the portable machine to become smaller, lighter, and more powerful.

Abstract: A portable 4-cycle engine with a configuration which allows cooling air to flow in the direction of the crankshaft relative to a cylinder head on a cylinder, and a portable machine equipped with this engine, are provided, respectively. In such an engine, the cylinder is separated from the cylinder head including a combustion chamber formed at the cylinder side therein. The engine further comprises a valve train area formed in the cylinder head at the downwind side of the cooling air, and a plurality of vertical fins protruding upward from the cylinder head and extending in the direction of the crankshaft. The valve train area and the plurality of vertical fins are all integrally formed with the cylinder head, so that the cylinder head can be made thinner and lighter with high rigidity to enable the portable machine to become smaller, lighter, and more powerful.

Abstract: In some aspects of the invention the invention will relate to conversion of an existing VW air cooled engine to liquid cooling, and in still further aspects it will relate to the design of a water jacket to maximize heat rejection of a combustion chamber and piston through perimeter cooling.

Abstract: An inventive cooling unit for an internal combustion engine comprises a plurality of cooling fins provided on outer surfaces of a cylinder block and a cylinder head, and vibration control rubbers interposed between cooling fins that face each other so as form a cooling air guide which guides air flow along lateral sides of the engine to rear parts of the engine. The cooling unit significantly increases the cooling efficiency of a cylinder and prevents vibration of cooling fins by interposing vibration control rubbers between cooling fins that face each other. The vibration control rubbers are formed in a streamlined shape and direct the flow of traveling air within the cooling fins about the exterior surface of the engine. The arrangement of the vibration control rubbers on side surfaces of the engine is such that angle ? of longitudinal axes of the vibration control rubbers with respect to the advancing direction of the vehicle becomes gradually larger moving from the front to the rear of the engine.

Abstract: In an inclined engine where a cylinder (2) projects from a crank case (1) obliquely and upwardly, when seen in a direction parallel to a center axis (3) of a crank shaft (10), under a specific observation condition in which the cylinder projecting direction is deemed as an upper right side, a valve operating cam gear (5) meshes with a crank gear (4) from a horizontal right side of the latter and a governor gear (6) is arranged in a space defined below a portion where the valve operating cam gear (5) meshes with the crank gear (4). This governor gear (6) engages with the valve operating cam gear (5) from a lower left side of the latter.

Abstract: The present invention provides an air-cooled four-stroke internal combustion engine capable of achieving a high degree of cooling. The present invention is directed to an air-cooled four-stroke internal combustion engine including a crankshaft and a fan rotor rotatably driven by the crankshaft to generate cooling air for cooling the engine. The engine comprises an oil pan disposed below the crankshaft. A space formed below the oil pan extends in the axial direction of the crankshaft along the lower surface of the oil pan and allows a cooling air to pass therethrough. An upstream portion of the lower surface is inclined upward, toward the upstream, in a vertical section taken along the axis of the crankshaft to receive the cooling air therein.

Abstract: A heat transfer head (10) for a stirling engine is disclosed. The heat transfer head (10) comprises a plurality of external circumferential fins (30) projecting out from the heat transfer head (10). At least two of the adjacent fins (30) are arranged to be substantially parallel and such that some of the radiant heat received by one of the fins is reflected onto the other fin. A second set of fins (40) is provided above the circumferential fins. The second set of fins are arranged to enable combustion gases from a burner to pass upwards therebetween to enable heat to be absorbed from the passing combustion gases.

Abstract: A four-stroke engine includes a cylinder block, a cylinder head mounted on the cylinder block, multiple cooling fins formed on the cylinder block and the cylinder head, a combustion chamber and an intake port and exhaust port formed in the cylinder head and in communication with the combustion chamber. A cooling jacket is formed in the cylinder head only between a virtual object generated by the intake port or exhaust port being rotated about a cylinder axis. A mating surface of the cylinder head on the cylinder block.

Abstract: Engine cooling system and method for making same wherein an engine, engine casing, or component thereof or a component related thereto has at least one cooling fin (18) having at least a portion of an edge surface (32) including an engraved, or intagliated portion (40). Preferably the surface edge includes a plurality of intagliated portions (40) with each portion including at least two elongated concavities being in preselected orientation and relationship to each other to improve the cooling efficiency of the fin and thus allow the engine to operate in wider, more extreme range of temperature and environments. The present invention is particularly well suited, but not limited to air-cooled engines and related components such as component covers, inspection/access covers, and oil coolers and is therefore readily adaptable to engines used to propel motor vehicles such as, but not limited to, motorcycles.

Abstract: An internal combustion engine includes a cylinder block with cooling fins cast integral therewith, and a cylinder head bolted on top of the cylinder block, first coolant passages being provided in the area of at least one cylinder contained in the cylinder block, which passages are connected to second coolant passages located in the cylinder head. Cooling efficiency is increased by providing heat exchange passages in an outer region of the cooling fins, which together with the first coolant passages and the second coolant passages, form a closed loop system within the engine.

Abstract: An internal combustion engine includes an engine block with at least one cylinder, a cylinder head which is fastened to the cylinder, the outside of the cylinder and the cylinder head including cooling ribs in order to discharge the heat produced during operation of the internal combustion engine, and including an oil pump for conveying the engine oil through oil lines to the parts of the internal combustion engine to be lubricated and to an oil cooler for cooling the engine oil. An effective and even cooling of the internal combustion engine is ensured in such a way that the oil cooler is integrated in the cooling ribs of the internal combustion engine and two mutually separated oil conduit systems are provided in the cylinder head, namely lubricating oil system and a cooling oil system.

Abstract: The invention relates to internal combustion engine, with an engine block with at least one cylinder, with a cylinder head which is fastened to the cylinder, with cooling ribs which are disposed on the outside of the cylinder and the cylinder head in order to discharge the heat produced during the operation of the internal combustion engine, and with an oil pump for conveying the engine oil through oil lines to the parts to be lubricated of the internal combustion engine and to an oil cooler for cooling the engine oil. An effective and even cooling of the internal combustion engine is ensured in such a way that the oil cooler is integrated in the cooling ribs of the internal combustion engine and two mutually separated oil conduit systems are provided in the cylinder head, namely a lubricating oil system and a cooling oil system.

Abstract: A single cylinder, internal combustion engine with a dry sump lubrication system. The engine includes an engine housing in which the overhead camshaft and crankshaft are rotatably supported, and the housing includes an integrally formed cylinder and head. A timing belt disposed externally of the engine housing interconnects the crankshaft and camshaft, and a piston connected to the crankshaft reciprocates within an internal bore provided in the engine housing cylinder. The cylinder wall around the internal bore is of a generally uniform thickness and circumscribed by cooling fins such that the cylinder resists bore distortion during operation. Dry sump lubrication is obtained by an external oil reservoir connected to a pump which supplies pressurized oil to the bearing journals of the camshaft. A portion of the oil at the camshaft bearing journals flows through passages provided within the cylinder to lubricate the bearing journals of the crankshaft.